Spin-Wave Effects in Magnetic-Film Switching

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Abstract
The nonlinear reaction of dispersion‐induced spin waves on the uniform mode m0 has been calculated for a thin film undergoing rapid rotational magnetization reversal. It is found that if m0 rotates faster than longitudinal spin waves can relax, the magnetization goes through a transient state of high magnetostatic energy. If the pulse switching field Hp is less than a critical field Hpc, the uniform mode becomes locked at some point in the reversal process; rotational switching cannot proceed until initially longitudinal spin waves have relaxed into components propagating in the instantaneous direction of m0, a highly damped process suggestive of the intermediate‐speed reversal mode observed in thin films. The dependence of Hpc on a dc bias field has been verified experimentally; the dispersion dependence should provide a crucial test of the theory.

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